机翼上反角对超声速民机全声爆毯声爆特性影响研究
Research on the Effect of Wing Dihedral on Full-carpet Sonic Boom
陈晴 1韩忠华 1杨瀚 1丁玉临 1乔建领 1郑可风 1宋文萍1
作者信息
- 1. 西北工业大学 航空学院,陕西 西安 710072;西北工业大学 航空学院 翼型、叶栅空气动力学国家级重点实验室,陕西 西安 710072
- 折叠
摘要
超声速民机是下一代民机的重点发展方向之一,但声爆仍是制约其投入商业运营的关键核心问题.然而,现阶段低声爆设计相关研究大多针对航迹正下方开展,缺少对全声爆毯声爆特性的考虑.针对该问题,本文开展了机翼上反角对全声爆毯声爆特性影响研究.首先,定义了全声爆毯平均声爆强度,该物理量考虑了不同周向角声爆的感觉声压级与影响域宽度,可衡量全声爆毯的声爆水平;然后,采用声爆快速预测方法研究了机翼上反角与全声爆毯声爆强度之间的关系;最后,通过计算流体力学(CFD)数值模拟分析了机翼上反抑制声爆的原理与对近/远场波形及地面感觉声压级的影响.结果表明,机翼上反能够减弱机翼下方各周向角的激波强度,从而降低整个地面声爆毯内的声爆水平;针对研究构型,13.88°上反角可将全声爆毯平均声爆强度降低3.23PLdB.
Abstract
Supersonic transport is one of the primary directions for the next generation of civil aircraft,but the sonic boom remains a key problem that restricts its commercial operation.However,most of the researches on low-boom design focus on the under-track sonic boom of the aircraft without sufficient consideration about sonic boom characteristics in the whole carpet.To address this problem,a study is conducted to investigate the effect of the wing dihedral on the full-carpet sonic boom characteristics.firstly full-carpet average boom intensity is defined.This physical quantity takes both the perceived level decibel and boom carpet width into account,which can be used as a metric of the sonic boom in the whole carpet.Secondly a rapid sonic boom prediction method is employed to investigate the relationship between the wing dihedral height and full-carpet average boom intensity.Finally,the sonic boom suppression mechanism of the wing dihedral and effects on near/far-field waveforms and ground loudness level are analyzed using Computational Fluid Dynamics(CFD)numerical simulations.Results indicate that dihedral wing can mitigate the shock intensity at all azimuthal angles below the wing,thereby resulting in a reduction of the sonic boom level across the entire sonic boom carpet.For the research wing-body configuration,a dihedral angle of 13.88° decrease the full-carpet average boom intensity by 3.23PLdB.
关键词
超声速民机/声爆/机翼上反/声爆毯/低声爆设计Key words
supersonic transport/sonic boom/wing dihedral/boom carpet/low-boom design引用本文复制引用
出版年
2024
NETL
NSTL
维普
万方数据